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DIN 17175-1979 Heat resistant seamless steel pipe technical delivery conditions Heat-resistant seamless steel pipe (including cold heading tubes) is used for boilers, pipes, pressure vessels and other structures, the temperature reaches 600 . 1. Manufacturing method Hot-rolled, cold-rolled, hot extrusion, hot drawing or cold drawing. With oxygen converter steel pipe, open hearth or furnace. 2. Quality rating Steel pipe is supplied in two quality grades (`and b). Non-alloy steel pipe for`, b two kinds of quality grade, while for the alloy steel pipe only a quality levels. Quality rating is chosen by the users their own. 3. Delivery status Pipe should be supplied with the appropriate heat treatment status, depending on the type of steel, the following heat treatments are adopted: - Normalizing; - Semi-critical annealing; - Quenching and tempering, continuous cooling from quenching temperature and subsequent tempering; - Quenching and isothermal transformation tempering.
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